EP 0631194 A1 19941228 - toner aggregation processes.
Title (en)
toner aggregation processes.
Title (de)
Toneraggregierungsverfahren.
Title (fr)
Procédé d'aggrégation de révélateur.
Publication
Application
Priority
US 8311693 A 19930625
Abstract (en)
A process for the preparation of toner compositions comprising (i) preparing a pigment dispersion in water, which dispersion comprises pigment, a counterionic surfactant with a charge polarity of opposite sign to the ionic surfactant of (ii) and optionally a charge control agent; (ii) shearing the pigment dispersion with a latex comprised of resin, ionic surfactant, nonionic surfactant, and water; and wherein the latex solids content, which solids comprise resin, is from about 50 weight percent to about 20 weight percent thereby causing a flocculation or heterocoagulation of the formed particles of pigment, resin and optional charge control agent; diluting with water to form a dispersion of total solids of from about 30 weight percent to 1 weight percent, which total solids comprise resin, pigment and optional charge control agent contained in a mixture of said nonionic, ionic and counterionic surfactants; (iii) heating the above sheared blend at a temperature of from about 5 to about 25 DEG C below about the glass transition temperature (Tg) of the resin while continuously stirring to form toner sized aggregates with a narrow size dispersity; and (iv) heating the electrostatically bound aggregated particles at a temperature of from about 5 to about 50 DEG C above about the Tg of the resin to provide a toner composition comprising resin, pigment and optionally a charge control agent.
IPC 1-7
IPC 8 full level
G03G 9/08 (2006.01); G03G 9/087 (2006.01); G03G 9/09 (2006.01); G03G 9/097 (2006.01)
CPC (source: EP US)
G03G 9/0804 (2013.01 - EP US); G03G 9/0812 (2013.01 - EP US); G03G 9/0815 (2013.01 - EP US)
Citation (search report)
- [A] EP 0302939 A1 19890215 - NIPPON CARBIDE KOGYO KK [JP]
- [A] EP 0162577 A2 19851127 - HITACHI CHEMICAL CO LTD [JP]
- [A] EP 0535246 A1 19930407 - FUJITSU LTD [JP]
- [A] EP 0227097 A1 19870701 - NAGASE CHEMICALS [JP], et al
- [A] EP 0197242 A2 19861015 - TORAY INDUSTRIES [JP]
- [A] EP 0225476 A1 19870616 - NIPPON CARBIDE KOGYO KK [JP]
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0631194 A1 19941228; EP 0631194 B1 19980304; DE 69408738 D1 19980409; DE 69408738 T2 19980924; JP H07146586 A 19950606; US 5405728 A 19950411
DOCDB simple family (application)
EP 94304596 A 19940624; DE 69408738 T 19940624; JP 13415594 A 19940616; US 8311693 A 19930625